User`s manual
Page 47
DVSI Confidential Proprietary
USB-3000™
User’s Manual Version 1.6a
Section 4 - Data and Configuration Packets
Digital Voice Systems, Inc.
The Speech Compression Specialists
From the above example, the following is the response packet from the AMBE-3000™ Vocoder Chip:
Packet Format with Parity Field
Control / Configuration RESPONSE Packet For PRODUCT VERSION STRING
Packet Header Fields Parity
START_BYTE LENGTH TYPE
Control
Packet
Field ID
Response Field
Data
PKT_
PARITY
PARITY_
BYTE
(1 byte) (2 bytes) (1 byte) (1 byte)
(
48 bytes)
(1 byte) (1 byte)
61 00 33 00 31
47
2E
56 31 32 30
2E 45 31 30
5 E
3 6
35 31 34
52 30 30
37 2E 41 30
30 33 30 36
30 38 2E 43
32 30 38 00
2F 73
30 2E 58 58
8 58 2 43
1 30 3 2E
30 30 32 30
Table 5 PKT_VERSTRING Response Field
Again, the first byte (0x61) is the packet header byte. The next two bytes (0x0033) specify the total length of the
pe is a control packet. The next byte (0x31) is the
eld identifier for a indicating it is a PKT_VERSTRING response. The next 48 bytes is a null-terminated string
at contains the product version in hex (V100.E100.XXXX.C106.G514.R007.A0030608.C0020208 in
3).
packet fields (51 bytes in this example). Note that the total packet length including the header, length, and type
is 55 bytes. The next byte (0x00) specifies that the packet ty
fi
th
ASCII). The last two bytes (0x2F73) show that parity fields are enabled (0x2f) and the parity field value (0x7